Keyboard



FIG. 1 is a top plan view of a keyboard showing our new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is an opposite side elevational view thereof;

FIG. 4 is a front elevational view thereof as seen in the direction of arrow 4 in FIG. 3;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a keyboard, as shown and described. 